Preliminary geologic map of Seattle and vicinity, Washington

Waldron, Howard Hamilton

doi:10.3133/ofr61168

Cited by 4 publications

(11 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Accordingly, he proposed the name Puget Group (White, 1888, p. 446-447). Since then, the name Puget has been used consistently to refer to the coal-bearing brackish-and fresh-water arkosic sandstone and shale of Eocene and locally younger age in the Puget Sound lowland (Willis, 1898a;Landes, 1902;Smith, 1902;Evan?,, 1912;Weaver, 1916Weaver, , 1937Warren and others, 1945;Crandell and Gard, 1959;Waldron, 1962;Vine, 1962a). Most writers have followed White's usage of the name Puget Group, but some (Willis, 1898a;Evans, 1912) have referred to these rocks as the Puget Formation and Puget Series.…”

Section: Puget Groupmentioning

confidence: 98%

“…2). Geologic maps have been published separately for several of the quadrangles: Buckley ; Poverty Bay, Des Moines, and Duwamish Head (Waldron, 1961(Waldron, ,1962(Waldron, ,1967; and Renton, Auburn, and Black Diamond (Mullineaux, 1965a, b, c). Final reports on the Lake Tapps 15-minute quadrangle (Crandell, 1963;Gard, 1968) include geologic maps of the Sumner, Buckley, Orting, and Wilkeson T^-minute quadrangles.…”

Section: Location Purpose and Scopementioning

confidence: 99%

“…In this region, the group has been subdivided into three formations. They are, from oldest to youngest, the Tiger Mountain Formation (Vine, 1962a), which is typically arkosic; the Tukwila Formation (Waldron, 1962), composed mostly of volcanic materials; and the Renton Formation (Waldron, 1962), composed of arkosic strata. The upper two of these formations crop out in the Renton quadrangle.…”

Section: Puget Groupmentioning

confidence: 99%

“…The Tukwila Formation, which underlies the Renton Formation in the Renton district, was named for the city of that name on the west side of the Duwamish Valley about 2 miles southwest of Renton (Waldron, 1962). The Tukwila crops out extensively in northwest Renton, and sparsely just south of the city.…”

Section: Tukwila Formationmentioning

confidence: 99%

“…At a locality 3 miles northwest of Renton, the Tukwila is in apparent fault contact with older marine sedimentary rocks (Waldron, 1962). About 10-15 miles east of Renton, near Tiger Mountain, the Tukwila conformably overlies and iiiterfingers with the Tiger Mountain Formation (Vine, 1962a).…”

Section: Stratigraphic Relationsmentioning

confidence: 99%

See 4 more Smart Citations

Geology of the Renton, Auburn, and Black Diamond quadrangles, King County, Washington

Mullineaux¹

1970

Professional Paper

View full text Add to dashboard Cite

Section: Puget Groupmentioning

confidence: 98%

Section: Location Purpose and Scopementioning

confidence: 99%

Section: Puget Groupmentioning

confidence: 99%

Section: Tukwila Formationmentioning

confidence: 99%

Section: Stratigraphic Relationsmentioning

confidence: 99%

See 3 more Smart Citations

Geology of the Renton, Auburn, and Black Diamond quadrangles, King County, Washington

Mullineaux¹

1970

Professional Paper

View full text Add to dashboard Cite

Geophysical investigation of the southern Puget Sound area, Washington

Daneš¹,

Bonno²,

Brau³

et al. 1965

J. Geophys. Res.

View full text Add to dashboard Cite

Detailed surface geology and gravity maps of the Puget Sound area, combined with limited magnetic observations, earthquake epicenters, and well records, have been studied in order to determine the geologic structure of the region. The Puget Sound lowlands are a deep crustal depression separated from the Olympic Peninsula by an active fault of about 4000 m throw. The basin is divided into three main parts by an igneous horst with an older gabbroic core and younger basaltic layers. The northeastern part of the basin, centered around Seattle, has sedimentary thicknesses of about 10,000 m. The southern part, centered near Tacoma, and the western one, around Skokomish, are about 4000 m deep. Faults along the horst are active, the northern one more so. Surface geological work is hampered by a thick layer of glacial till.

show abstract

Three-Dimensional Simulations of Ground Motions in the Seattle Region for Earthquakes in the Seattle Fault Zone

Frankel

Stephenson

2000

Bulletin of the Seismological Society of America

View full text Add to dashboard Cite

We used the 3D finite-difference method to model observed seismograms of two earthquakes (M L 4.9 and 3.5) in the Seattle region and to simulate ground motions for hypothetical M 6.5 and M 5.0 earthquakes on the Seattle fault, for periods greater than 2 sec. A 3D velocity model of the Seattle Basin was constructed from studies that analyzed seismic-reflection surveys, borehole logs, and gravity and aeromagnetic data. The observations and the simulations highlight the importance of the Seattle Basin on long-period ground motions. For earthquakes occurring just south of the basin, the edge of the basin and the variation of the thickness of the Quaternary deposits in the basin produce much larger surface waves than expected from flat-layered models. The data consist of seismograms recorded by instruments deployed in Seattle by the USGS and the University of Washington (UW). The 3D simulation reproduces the peak amplitude and duration of most of the seismograms of the June 1997 Bremerton event (M L 4.9) recorded in Seattle. We found the focal mechanism for this event that best fits the observed seismograms in Seattle by combining Green's functions determined from the 3D simulations for the six fundamental moment couples. The February 1997 event (M L 3.5) to the south of the Seattle Basin exhibits a large surface-wave arrival at UW whose amplitude is matched by the synthetics in our 3D velocity model, for a source depth of 9 km. The M 6.5 simulations incorporated a fractal slip distribution on the fault plane. These simulations produced the largest ground motions in an area that includes downtown Seattle. This is mainly caused by rupture directed up dip toward downtown, radiation pattern of the source, and the turning of S waves by the velocity gradient in the Seattle basin. Another area of high ground motion is located about 13 km north of the fault and is caused by an increase in the amplitude of higher-mode Rayleigh waves caused by the thinning of the Quaternary deposits.

show abstract

Preliminary geologic map of Seattle and vicinity, Washington

Cited by 4 publications

References 0 publications

Geology of the Renton, Auburn, and Black Diamond quadrangles, King County, Washington

Geology of the Renton, Auburn, and Black Diamond quadrangles, King County, Washington

Geophysical investigation of the southern Puget Sound area, Washington

Three-Dimensional Simulations of Ground Motions in the Seattle Region for Earthquakes in the Seattle Fault Zone

Contact Info

Product

Resources

About